YouTube co-founder and CEO Chad Hurley and AdMob founder and head Omar Hamoui are leaving their positions at the Google-acquired companies, according to reports.

Hurley told reporters at the F.ounders international Web conference in Dublin that he was in the process of transitioning out of his role at YouTube and that he would become an advisor to the video-sharing site and work on other projects at Google. (The Guardian has audio here.) Salar Kamangar, who's been the de facto head at YouTube for the past two years, will officially step into Hurley's role, according to The Wall Street Journal.

Chad Hurley

AdMob's Hamoui is leaving Google "for personal reasons," the company told the Journal. Google didn't say who would replace Hamoui at AdMob.

Google acquired AdMob, a mobile-advertising leader, in May for $750 million, after a Federal Trade Commission investigation.